[bloodhound31]

My instruction manual tells me to take flats at 0.1 second and look for a FWHM of around 20000.

At 0.1 I'm getting FWHM values of 35000 to 40000
At 0.5 I'm getting FWHM values of 50000 and up
at 0.01 I'm getting FWHM values of 28000.

0.01 is a small fraction of 0.1 so is this right? will it work? I've tried reducing the exposure times even further but that's getting into the realm of bias frames is it not?

Oh, and I;m using a light box.

Correction: everyhwere I have said FWHM, I meant MAX pixel value.... oops.